Third Gear, Straight Travel Operation.

TM 9-2520-249-34&P

Throttle Valve and Throttle Valve

and paragraph 2-43b, for description of pivot water-steer

operation.

Regulator. The throttle is shown at half-throttle position.

d. Steer Relay Valve.

Main-pressure oil

At this position, below three-quarter throttle, TV pressure

enters at the bottom of the steer relay valve and forces

is blocked by the throttle valve, and upward movement

it to the upward position. This allows the engaged steer

of the lockup shift valve is dependent on only pitot

clutches (in neutral and first gear) to exhaust through

pressure. Thus, the lockup clutch can be engaged at a

their respective steer circuits.

predetermined turbine speed.

e. Drive Relay Valve.

Main-pressure oil

NOTE

enters at the top of the drive relay valve and forces it to

The related mechanical functions required

the downward position. This allows main-pressure oil

for this travel condition are described in

from the steer valves to enter and be directed to the

paragraph 2-50b, and illustrated in.

output clutch apply circuits. These charged circuits

deliver oil to the pressure side of the output clutch

pistons causing the output clutches to engage (fig. 2-

2-37.

Third Gear, Straight Travel Operation.

13).

Figure 2-5. Hydraulic system, third gear, straight travel operation schematic view.

2-18